The ornamental design for a lantern with built in radio and flashlight, as shown and described.
FIG. 1 is a front and left side perspective view of a lantern with built in radio and flashlight, showing my new design, with the controls and lighting elements shown in phantom;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan thereof; and,
FIG. 7 is a bottom plan view thereof with the feet and battery compartment shown in phantom.
The broken line is included for the purpose of illustrating portions of the lantern and forms no part of the claimed design.